Robert c



17 192 May R. c; DANLY TUNING PIN HOOKS AND METHOD OF MAKING THE SAME Filed April 26, 1926 Jade/1507" D jfoert 613% Patented May 17, 1927.

UNITED STATES PATENT OFFICE.

ROBERT C. DANLY, OF CHICAGO, ILLINOIS, ASSIGNOR TO LUDWIG & LUDWIG. INC., OF

CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TUNING PIN HOOKS AND METHOD OF MAKING THE SAME.

Application filed April 26, 1926.

This invention relates to the productionof hook members for tuning pins of musical drums and the like by a stamping operation from blanks of plate metal. And the pres- I out improvement has for its objects:

To produce an article of the multiple hook type from a blank of plate metal and the formation of said blank by a series of forming die operations to produce an article which is much lighter, stronger and more economical of manufacture than the ordinary cast metal hook member heretofore in general use, all as will hereinafter more fully appear.

In the accompanying drawing Fig. 1, is a. side elevation of a hook member and associated operative screw threaded pin or bolt.

Figs. 2 and 3, are front and rear elevations, respectively, of the same. I

Fig. 4,-is a transverse section at the midwidth of the parts.

Fig. 5, is a top view of the same.

Fig. 6, is an elevation of the blank or stamping.

Fig. 7, is an edge view of the same.

Fig. 8, is a front elevation .of the blank, in the initialformation of same, with a bearing web and with a U shape bend or rib for engagement with the tuning pin or bolt.

Fig. 9, "is a transverse section at the midwidth of the blank shown in Fig. 8.

Fig. 10, is a front elevation of the blank in a succeeding formation of the same, and with reinforcing hollow ribs formed in the wing members'of the blank, previous toa final formation of said wings into the .hook shape illustrated in Figs. 1, 2, 3 and 4.

11 isa transverse sectionat the mid width of the structure shown in 10.

Like' reference numerals indicate like parts in the several views. 7

In the present method of making plate metal hooks for the tuning means of musical drums and the like,.a series of successive operations are employed, as follows The initial formation of a flat plate metal blank or stamping, shown in Figs. 6 and 7, and comprising a main plate portion 1, pref erably of a tapering shape, from the broad end of whichextend a pair of flat wings2 in spaced and parallel relation to each other and having an approximately rectangular shape. In addition the main portion 1 is formed with an extension or car 3 of a Serial No. 104.625.

'hook member is associated. Simultaneously with. or in an immediately succeeding operation, as found most desirable, the extension or car ofthe main portion 1 of the blank is folded and drawn laterally to said main portion to constitute a closure web 6 for one end of the channel formed by the bend or rib 4 aforesaid, as illustrated in Figs. 4, 8, 9'

and 11.

The next succeeding operation on the blank or stamping in its last described formation and by-suita-ble forming dies, consists in the formation of hollow reinforcing ribs or embossments 7 at the midwidth of the wings 2 of the blank, with said ribs tapering from their midlength to their respective ends, as shown. Simultaneously with, or in an immediately succeeding operation each wing 2 is bent laterally into a semi-hook form as illustrated in Fig. 11. "The next succeeding operation on the blank or stamping in its last described formation, and by suitable forming dies, consists in bending into a. complete hook shape the partially bent endsof the wings 2 as illustrated in Figs. 1 and 4.

The final operation on the blank or stamping in its last described formation and by suitable punching dies, consists in forming a central orifice 8 in the bearing web 6 aforesaid, for the passage of and engagement with the shank portion of the tuning pin or bolt 5. as shown in Fig. 4.

The usual washer 9 may be interposed between the top of the web 6 and the under face of the non-circular operating head 5' of the tuning pin or bolt.

Havingthus fully described my invention, what I claim and desire to secure by Letters Patent, is

1. The method of forming an article having a pair of book shape wings in spaced relation which comprises the blanking out of a plate metal blank having a flat main portion, a pair of flat wings in spaced relation and anextension intermediate of said wings, forming said blank along its midwidth with a hollow rib providing a re- 5 eeiving ehannel, defiecting said intermediate extension to form aiclosure web for an end of the channel formed by the hollow rib, forming a central orifice in" s ai'd closure web,

and bending the free ends of the wings into w a hook form.

2. The method of forming an arliele having 'a pair of hook shapeafings in spaced relation, which comprises the blank ng oat of a plate metal blank haxi11g a fiat mam portionp'a pair of flat-wings in spaced relation and an'efitension intermed ia teLofsaid wings, forming said along ts m dwidth with a hollow rib of a Ushapeprovrd- 'ing a reeeiying'chapnel, deflectingsaidmit'e'rme'diate extension to form. a fel osnre web for' an 'end of: th e'" .cha nnel' 3 formed the hollow 'iib,'f orming a central orifice in Q said 'c'losi'l1'e"\'yeb,' and 'bend'ng' the freeends of shavings; m5 liable: ofrin." a

{ Q memberof the eliara etiii"described Inad e of spaced relation"andliavingf their free ends formed into hooks. and with an extension ,between the bases of s aid wings, said exten sion being deflected laterally to form a closure web for an end of the ehannelfor ned by the aforesaid liollmei'ib of the main po|' lion. said web beingformed with a central orifice for an a eiate(l t ming bolt.

6. As an article of mamiiavtnre. a hook 1nember of t h e .cl a raeter described made of plate metal and comprising: :1 [lat main por- 71 Lion formed with a holiOW. rib ot a U shape midway its width prmiding a receiving channel, with a pair of mtegralwmgs extending in spaced. relation andhavmgtheir free ends formed. into hooks, and with anextension between the;bases of said avings, said extension being deflected laterally to form a closure web for an end of theehannel formed by the aforesaid hollow rib of the main} p ortion,. sa i d web" being formed avith a central ,.orifice ,for an associated, tuning bol f 7. As. an article of nranniactur a hook member of the character deseribedmade of plate metal,and ,co1nprising aifiat main portion of a taperingvshape and. fiormed with a hollow rib .midway. its widthproviding a ehannel formed by" :the., l1ollow. .rib, of said mainportion said web being formed with a centraL orifice for an. associated tuning-bolt.

As, n article. of mantrfaeture, a--ho0k member oil the, ehaliagter describedi .made of plate jinet al and eomprising,.a flatanain portion forrnec with a.;hol1;ow rib mid-wayio'f its width providing a .reeeiving :ehannel, with .11 pair pf integral. .\gings extending in spaced relation and .iormqdwithhollow-rei l q lllfl ri s. wh h taP -i Q lflwi lengtlrto theinrespeetiye e nds,.,with=thelfree ,.19 ends of t liev w.i ngs. bent iiIltO a ihookmfonm; the niain portion having an extension gbetwen the bases of said wings whieh is-defieet ed 2 laterally to for-me a closure web -for an end 'of the ehannelionmedbythe-liollow 1, rib of said maih portion, .said wvebabeing formed with a central qrifioe forran assostat tunin o r '9. As an: artiele qf -manufacture, a :hook member of ,the eharaetenglescribed madeOf plate metallan d comprising a. fiat nain. por-, tion fo r1ned with a hollow.. rib of:a:, U shape midway itswidth providing a Hreceiring ehannel, \'Y-ith a pair of integraL-wings extending in spaced.relation and formed with 2. hollow rehifoi'eing ribs which taper from their midlength to their respective-lends with the fij eeiendsof the win s .bent...into a. hooloform, the main portion having an ,extension" between the bases of said wings which is deflected laterally to form a closure web for an end of the channel formed by the hollow rib of the main portion said web having a central orifice for an assecialed tuning bolt.

10. As an article of manufacture, a hook member of the character described made of plate metal and comprising a flat main portion of a tapering shape and formed with a hollow rib midway its Width providing a receiving channel, with a pair of integral wings extending in spaced relation 7 and formed with hollow reinforcing ribs which taper fI'OllttllGll midlength to their respective ends, with the free ends of the Wings bent into a hook form, the main portion having an extension between the bases of the wings which is deflected laterally to form a closure web for an end of the channcl formed by the hollow rib of the main portion, said web having a central orifice for an associated tuning bolt.

Signed at Chicago, Illinois, this 24th day of April 1926.

ROBERT C. DANLY. 

